Calibration systems and methods for setting PLL gain characteristics and center frequency

摘要: Calibration systems and techniques for phase-locked loops (PLLs) provide precise setting of the center frequency and/or uniform voltage controlled oscillator (VCO) gain characteristics. Center is calibrated by imposing a selected at output PLL driving control V c across PLL's filter to predefined, steady state indicative circuit calibration. The approach can be employed calibrate any imposed VCO output. calibration accomplished employing technique only with low point on A high transfer function applying known corresponding frequency. Once are calibrated, slope defined. Various integrated PLL/calibration system embodiments presented.